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function showon(what){ what.style.visibility='visible'; }
function hide(what){ what.style.visibility='hidden'; }
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<TABLE width=250 height=200 Border=3  bordercolor="paleturquoise"  bgcolor="003300">
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<TD onClick='hide(memo1)'>
<FONT SIZE=2 color=green  > ◈  알림창 ◈ <BR><BR>
              여기를 클릭하면  <BR>  알림창이 사라집니다  <BR><BR>  쓸말등등  <BR>  </FONT>
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